我正在用 HTML、javascript 和 jQuery 开发一个网站。我想在 ajax 请求中将图像上传到 amazon s3 服务器。没有这样的 SDK 可以将 s3 集成到 Javascript 中。有一个 PHP SDK 可用,但它对我没有用。任何人都可以在javascript中提供解决方案吗?
5 回答
根据这篇文章,让 Amazon S3 和 CORS 使用 XMLHTTPObject 处理 js 和 html5 。
1:CORS 仅适用于正确的 URL“ http://localhost ”。(文件///xyz 会让你发疯)
2:确保您正确编译了 POLICY 和 Secret - 这是我的策略,这是您可以获取项目以帮助您开始使用Signature 和 Policy的链接- 永远不要使用您的 Secret 发布此 JS!
POLICY_JSON = { "expiration": "2020-12-01T12:00:00.000Z",
"conditions": [
{"bucket": this.get('bucket')},
["starts-with", "$key", ""],
{"acl": this.get('acl')},
["starts-with", "$Content-Type", ""],
["content-length-range", 0, 524288000]
]
};
var secret = this.get('AWSSecretKeyId');
var policyBase64 = Base64.encode(JSON.stringify(POLICY_JSON));
console.log ( policyBase64 )
var signature = b64_hmac_sha1(secret, policyBase64);
b64_hmac_sha1(secret, policyBase64);
console.log( signature);
这是JS代码
function uploadFile() {
var file = document.getElementById('file').files[0];
var fd = new FormData();
var key = "events/" + (new Date).getTime() + '-' + file.name;
fd.append('key', key);
fd.append('acl', 'public-read');
fd.append('Content-Type', file.type);
fd.append('AWSAccessKeyId', 'YOUR ACCESS KEY');
fd.append('policy', 'YOUR POLICY')
fd.append('signature','YOUR SIGNATURE');
fd.append("file",file);
var xhr = new XMLHttpRequest();
xhr.upload.addEventListener("progress", uploadProgress, false);
xhr.addEventListener("load", uploadComplete, false);
xhr.addEventListener("error", uploadFailed, false);
xhr.addEventListener("abort", uploadCanceled, false);
xhr.open('POST', 'https://<yourbucket>.s3.amazonaws.com/', true); //MUST BE LAST LINE BEFORE YOU SEND
xhr.send(fd);
}
辅助函数
function uploadProgress(evt) {
if (evt.lengthComputable) {
var percentComplete = Math.round(evt.loaded * 100 / evt.total);
document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
}
else {
document.getElementById('progressNumber').innerHTML = 'unable to compute';
}
}
function uploadComplete(evt) {
/* This event is raised when the server send back a response */
alert("Done - " + evt.target.responseText );
}
function uploadFailed(evt) {
alert("There was an error attempting to upload the file." + evt);
}
function uploadCanceled(evt) {
alert("The upload has been canceled by the user or the browser dropped the connection.");
}
然后是 HTML 表单
<form id="form1" enctype="multipart/form-data" method="post">
<div class="row">
<label for="file">Select a File to Upload</label><br />
<input type="file" name="file" id="file" onchange="fileSelected()"/>
</div>
<div id="fileName"></div>
<div id="fileSize"></div>
<div id="fileType"></div>
<div class="row">
<input type="button" onclick="uploadFile()" value="Upload" />
</div>
<div id="progressNumber"></div>
快乐 CORS !
亚马逊只是允许跨域资源共享,理论上它允许您的用户直接上传到 S3,而不使用您的服务器(和 PHP)作为代理。
这是文档-> http://docs.amazonwebservices.com/AmazonS3/latest/dev/cors.html
他们很好地告诉您如何在 S3 存储桶上启用它,但 iv 没有找到有关如何从客户端获取数据到存储桶的实际 javascript 示例。
发布 CORS.js 的第一人是传奇 xD
这是使用 CORS 和 javascript 在 Amazon S3 上上传可恢复文件的示例http://cotag.github.com/Condominios/
您可以通过 AWS S3 Cognito 执行此操作,请在此处尝试此链接:
http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/browser-examples.html#Amazon_S3
也试试这个代码
只需更改 Region、IdentityPoolId 和您的存储桶名称
<!DOCTYPE html>
<html>
<head>
<title>AWS S3 File Upload</title>
<script src="https://sdk.amazonaws.com/js/aws-sdk-2.1.12.min.js"></script>
</head>
<body>
<input type="file" id="file-chooser" />
<button id="upload-button">Upload to S3</button>
<div id="results"></div>
<script type="text/javascript">
AWS.config.region = 'your-region'; // 1. Enter your region
AWS.config.credentials = new AWS.CognitoIdentityCredentials({
IdentityPoolId: 'your-IdentityPoolId' // 2. Enter your identity pool
});
AWS.config.credentials.get(function(err) {
if (err) alert(err);
console.log(AWS.config.credentials);
});
var bucketName = 'your-bucket'; // Enter your bucket name
var bucket = new AWS.S3({
params: {
Bucket: bucketName
}
});
var fileChooser = document.getElementById('file-chooser');
var button = document.getElementById('upload-button');
var results = document.getElementById('results');
button.addEventListener('click', function() {
var file = fileChooser.files[0];
if (file) {
results.innerHTML = '';
var objKey = 'testing/' + file.name;
var params = {
Key: objKey,
ContentType: file.type,
Body: file,
ACL: 'public-read'
};
bucket.putObject(params, function(err, data) {
if (err) {
results.innerHTML = 'ERROR: ' + err;
} else {
listObjs(); // this function will list all the files which has been uploaded
//here you can also add your code to update your database(MySQL, firebase whatever you are using)
}
});
} else {
results.innerHTML = 'Nothing to upload.';
}
}, false);
function listObjs() {
var prefix = 'testing';
bucket.listObjects({
Prefix: prefix
}, function(err, data) {
if (err) {
results.innerHTML = 'ERROR: ' + err;
} else {
var objKeys = "";
data.Contents.forEach(function(obj) {
objKeys += obj.Key + "<br>";
});
results.innerHTML = objKeys;
}
});
}
</script>
</body>
</html>
如果需要,您可以使用github 链接
我希望它会帮助别人:)
对于身份验证部分,
没有 php 代码,没有服务器,没有大的 JS 代码,除了下面;
您可以使用 AWS Cognito IdentityPoolId 作为凭证,代码更少,但您需要创建 AWS Cognito IdetityPool 并附加策略,只需 s3 写入访问权限。
var IdentityPoolId = 'us-east-1:1.......'; AWS.config.update({ 凭证:新 AWS.CognitoIdentityCredentials({ 身份池 ID:身份池 ID }) });